... , RPI, HP, UHP used for arc furnaces Graphite Electrodes:-grade:RP, RPI(HD), HP, UHP-dia. 75-600mm; length ... other area such as electric arc furnace. Alloy furnace and calcium carbide furnace and other metallurgical furnace.Specifications: GradeItemsRegularRPImpregnatedRPI ( HD ... .3*male-female graphite electrodes: we can produce other grade also according to customer’s requirements.*we can produce to ...